STORM LAKE, Iowa (AP) _ A 19-year-old man walking on a track in northwest Iowa has been struck by a train. Police say 19-year-old Deon Parkhurst was heading west when he was hit from behind by a Canadian National locomotive around 4 p.m. Wednesday in Storm Lake. Parkhurst was taken to Buena Vista Regional Medical in Storm Lake and then flown to Mercy Medical Center-Sioux City. A hospital spokeswoman said Thursday that Parkhurst remained in critical condition. The incident is being investigated.